K&F Concept NP-FZ100 Battery and Charger for Sony A7iii Battery Compatible with Sony FX3, ZV-E1, Alpha A7iii, A7IV, A7RIII, A9, A6600, A7R IV (2 Pack 2280mAh Lithium-ion Batteries)
SKU: KF28.0005
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one year
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I guess that means they are safe to use the camera.
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No it doesn't, it seems like none of the batteries have a date code
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Yes, micro USB and USB-C are supported. It's great because you can use any micro USB cable and USB-C and take it with you.
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Regardless of supply voltage, all USB ports output 5VDC, between 0.5 and 2.5 amps. Any USB connector will work fine.
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Yes, it charges them quickly and then the light for that slot turns green. To me, that's an indication that it's going to lose power because the battery isn't hot the next day. (No, they don't need to be charged overnight, they're fast.)
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New decoding, support original charger charging
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It's hard to say exactly when. I've tried and can take over 1000 shots on a fully charged battery, hope this helps.
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Personally, I charge the battery ahead of time or when I arrive at my destination hotel. I then store the battery in my camera bag, separate from the charger. So far, I'm happy with these batteries.
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I've tried both, and it's pretty fast either way.